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Cached Exchange Mode Security?

Is there any way to secure an .ost file that is created when cached mode is turned on?  Here is the situation.  If a laptop is stolen and the ost file is extracted,  can any Outlook client open that file and see the contents?  Also what about an .ost to .pst converter?  Can this be ran on the file also?


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Hello,

We're currently in the process of migrating our Office 2000 environment to
Office 2003. During the roll-out we encountered an issue we didn't
experience in any of our tests before. It seems that the "Outlook Virus
Security" Setting, which allows you to disable the pop-up you get when an
Outlook Form tries to access your address book, is ignored or not applied
correctly when you use Cached Exchange Mode and a "different from setup
install image" menu language by using the Language Selector.

Let me describe our situation to better illustrate the problem. The
installed version of Office 2003 is based on the Office 2003 English image.
After installation, the language is modified to Dutch by using the Language
Selector tool. When configuring the MAPI account, Cached Exchange Mode is
enabled. When a user tries to open an Outlook Form in a Public Folder that
uses the e-mail addresses from your address book, a dialog box pop-ups
requesting permission for this action for 1, 2, or more minutes. This
behaviour has previously been controlled by using an Outlook Security
Template and the Group Policy setting "Outlook Virus Security Settings" that
points to the correct public folder. However, when running in Dutch WITH
Cached Exchanged Mode, the dialog box pop-ups still appear. When changing
the Office 2003 Language Settings to English OR when disabling the Cached
Exchange Mode, the dialog box pop-ups are correctly disabled.

I haven't been able to find a correct explanation for this behaviour, and
more importantly, not a working solution. The first thing that comes to mind
is to install the Dutch based setup install image, but we don't really like
to do that since we are catering for both English as well as Dutch users and
would like to keep the installations based on the same install image.

Can anyone give us any feedback on this please ?

Thanks,

Jo

Hi All,

My company is planning to enable Outlook's RPC over HTTPS feature to allow synchronization of emails for mobile users.
I understand that to use the feature, we need to enable Cached Exchange Mode on user's PC for better performance.
With Cached Exchange Mode enabled, a copy of the user's mailbox (OST file) will be stored locally at the user's PC.

The concern now is how do we ensure the security and confidentiality of user's OST files?

I supposed with the correct Outlook client configuration, user can always use their Home PC to connect to Company's Exchange server and download emails, not necessary using Company's notebook. We have no control over the MS patches/anti-virus update of user's Home PC.

Also, if user's notebook is stolen, whoever in possession of and has login access to the notebook would be able to access user's mailbox, am I correct?

Any advise on how I could secure the implementation of Cached Exchange Mode to mobile users is very much appreciated.

Thanks.

Regards,
cgng

Hi All,

My company is planning to enable Outlook's RPC over HTTPS feature to allow synchronization of emails for mobile users.
I understand that to use the feature, we need to enable Cached Exchange Mode on user's PC for better performance.
With Cached Exchange Mode enabled, a copy of the user's mailbox (OST file) will be stored locally at the user's PC.

The concern now is how do we ensure the security and confidentiality of user's OST files?

I supposed with the correct Outlook client configuration, user can always use their Home PC to connect to Company's Exchange server and download emails, not necessary using Company's notebook. We have no control over the MS patches/anti-virus update of user's Home PC.

Also, if user's notebook is stolen, whoever in possession of and has login access to the notebook would be able to access user's mailbox, am I correct?

Any advise on how I could secure the implementation of Cached Exchange Mode to mobile users is very much appreciated.

Thanks.

Regards,
cgng

We have a laptop that a few users share. If we are using Cached Exchange
Mode, I know that each user's emails are stored on the local hard disk.

Is there a security risk? Can other users check other users's emails?

thanks.

I'm looking for a way to improve performance for one of our senior managers that is constantly moving between our offices. His major complaint is the time it takes to open his attachments (predominately Excel).

I've read up on Cached Exchange Mode and it sounds like it will helping but I was wondering if anyone could tell me whether this would help his performance in Outlook whilst working in offices other than the one his mailbox is located in? I think from the reading I've done that Outlook would download the attachments to the cache before he tries to open the item, is this correct?

Thanks
Col

With Outlook 2003/Exchange 2003,

MAPI call OpenMsgStore() is failing when "cached exchange mode" is enabled. It gives the error 0x80040119

When "cached exchange mode" is disabled, it works fine.

Any help to fix????

Hi all-
Is there a registry key that turns cached exchange mode on and off?

We have 6 remote sites and when we run mailbox manager our bandwidth goes to he!. Right now, the site admins are turning CEM off manually, but it'd be way easier with a reg key or vbscript...

Thanks!
Joe

I've got an issue, when when in cached exchange mode, all entries in the calnder dissappear, yet when I take it out of cached exchange mode all the appointments reappear, I have ensured that the calender is included in the synch, and I have tried recreating the profile in cahced mode.

Any ideas?

Is there a downside to using "cached exchange mode"? How many of you guys use this mode on your exchange network?

Is anybody using this?
- what has your experience been so far (good /bad)

We are looking at putting in a remote office for 30 users with a 2mb connection back to our office.
Instead of putting in an exchange server in the remote office, I was planning to use cached exchange mode on the outlook clients...

Is there anything particular I need to take into consideration?

LennyMc

Hi Guys,

Planning to implement Exchange 2003 soon and I've been reading around that Cached Exchange Mode and ActiveSync don't work quite well together. I need the Cached EM because I have mobile users who need access to  their mail when they are not connected to the network. Do I need to worry about possible implications of implementing these two features?

Cheers

Ned

Can anyone tell me why Outlook 2003 will not display current content of a users inbox when "display cached exchange mode" is checked?  If I de-select cached mode, Outlook then displays everything in the users mail box.  With it checked I only see info up to a certain date, with nothing newer than that visible.  I have tried to delete the .ost file and recreate it but that has not solved the problem. This obviously only happens with Outlook 2003 and my mail server is Exchange 2000 SP3 running on a Windows 2000 Server with SP4.  Any help at all will be truly appreciated.  Thanks in advance.

We used Cached Exchange mode on our network.  When we have a user logon at another workstation (while logged into their primary workstation), they are unable to open Outlook 2003, it complains about the .ost file being missing.  If we set a new .ost file, they can then get email, but it will give that error message everytime.

The .ost file is located in the My DocumentsOutlook folder in the user's roaming network profile.

Anyone have general trouble with Cached Exchange mode?

I have one user who can't receive e-mail messages from an HP Digital Sender when his Cached Exchange Mode is enabled.  We have no idea where they go.. but if we disable CEM then he gets the messages.  We setup a new profile on a brand new PC and with his account it has te same problem.

I've got two other users who's Legatto Email Xtender doesn't work when in Cached Exchange Mode.  If we disable CEM then they work fine.  We've deleted the cache files and recreated them..

Anybody come across a problem like this?

Hi,

We're running two W2K3 servers- one is a DC and one is a dedicated Exchnage 2003 server.

Our Outlook 2003 clients were running in cached exchange mode, but I've had to disable it.

Whenever a user had to change their windows password (as a result of default W2k3 policy), the next time they used Outlook 2003, it stayed in an offline state (just as if the network cable had been unplugged).

As soon as cached exchange mode was disabled on the affected client(s), Outlook 2003 went back online. There are no connectivity problems on
the network.

Has anyone come across this before? Any ideas?
I'd like to re-enable C.E.M, but I'm not game to until I know what's going on.

Thanks,
Farfo.

Hi all

Since we have moved all uers to cached exchanged mode on outlook, alot of them cannot see mails in the deleted items box, is this a well known problem, or is there a fix?

please help

many thanks

Carl

My company uses Windows Server 2k3 and Exchange 2k3.  I connect from home via VPN and use Outlook 2k3 in cached exchange mode.  I recently had a hard drive failure after setting up my home office.  I had no backup of my .ost files done at home yet.  So, I got my new hard drive/pc up and running connected via the VPN and configured Outlook with cached exchange to download my emails/public folder blah blah.  To my surprise the emails were gone.  The sent items were there but the emails were not.  I thought that Cached Exchange Mode kept a copy of your mailbox and updated it when you were connected.  If this is the case then why were all my emails gone?  And how can I leave them on the Exchange server?  

I have about 30 remote users, at branch offices, that need to connect into our main office using outlook RPC over HTTPS. I am not a fan of Cached Exchange Mode and would rather not use it. I have had many issue with .pst files associated with Cached exchange mode. However, I want to give my users the best connection speed and also reduce bandwidth coming through my ISA server that I use to publish exchang for my remote users. In general will my users and my ISA/exchange server have better preformance using Cached Exchange Mode or not. Most have setup their send/receive settings to check/send new mail every two minutes. I am not concerned with users having off-line access, it causes more problems then it has ever solves. Should I just do away with Cached mode or is it really a bandwidth saver? I want to do away with it but won't if it means better performance. Thanks. Joe

When I have "Use Cached Exchanged Mode"on, I can't see all of my global access list. If I turn off Cached Exchanged Mode I can see all of my GAL... How can I keep using Cached Exchanged Mode but see all of my GAL? I'm running exchange 2003 and office 2003.

Thanks!

I have a weird problem...

I have a user whose name disappears from the GAL if the client looking him
up is running Outlook 2003 cached exchange mode. As soon as I turn off
cached Exchange mode, I can see the user's name again... Turning cached
exchange mode back on after that, does not help, as the user's name
disappears again... Anyone seen this?

Thanks,
Steve

I've posted a question several days ago regarding problems with Cached
exchange mode
It is similar to the phenomena described in this forum:
Subject: Inbox missing items in cached mode 9/15/2005 5:01 PM PST:
Some Outlook Inbox items don't appear in Cached exchange mode. If I uncheck
cached mode, all the Inbox items appear.

The problem is solved when I moved all messaged to other folder! I am now
sure it is related to non-english messages I recieved (from Italy) or
messages from IBM Lotus notes mail. I didn't isolate the exact problematic
message yet but from some reason it impacted outlook synchronization or
indexes of this folder.
Are you familiar with such problem?

I will try to install Italian language support but anyway such bug should
not appear without any worning in outlook.
Any help is appreciated!

Hi everyone,

When you activate cached exchange mode, the .ost file get automatically
saved into C:document and settingsuserLocal Settingsetcetc. How can
you change this default location to something else (so that it can be
captured in a directory under a roaming profile in Windows 2000/2003?

Also if the local hard disk (where .ost file is stored) get corrupted, how
can you start Oulook (it looks for the .ost file).

Hekp much appreciated.

Patrick

a users GAL is not syncing when he uses Outlook 2003 in cached exchange
mode. When i disable cached exchange mode, his global address list is
updated (he shows an old version of the address book when using cached
exchange mode).

any ideas?

Thx!

Is Outlook 2003 Cached Exchange Mode supported with Exchange 2000, or do I
need to be running Exchange 2003?

I'm looking at the MS deployment guide for Exchange 2003, which states:

"Exchange 2003 provides support for Outlook 2003 Cached Exchange Mode."

Does this mean that cached Exchange Mode is not supported in Exchange 2000?

Any tech docs on this?

Thanks!

My exchange 2000 server (with latest SP) has been running well for almost
three years. In the last few days I have had several users complain that
they can't download their mail. Switching off Cached Exchange Mode seems to
fix the problem, but it's a mess because they can't use the junk mail filter
in non-cached mode. I have seen a number of recent posts regarding this
problem in other forums. Does anyone have a clue as to what is causing this
problem? It seems to have cropped up only in the last few weeks.

Scott Graber
SysAdmin
Image Labs International
scottgraber "at" gmail "dot" com


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