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Since I found out about Outlook's "Cached Exchange Mode" I've been using it, and I also set it up on every PC I come across. I think it's a great feature that improves the efficiency of of every Outlook user, and I don't understand why it's not ON by default.

My question is - are there any disadvantages to using Cached Exchange Mode? (Besides the obvious fact that it consumes a bit more space, which I don't see as a big issue nowadays)

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Uuhhhh.... it IS on by default since Exchange 2003, unless you're using a customised installer package for Office/Outlook, or perhaps a Group Policy setting. –  ThatGraemeGuy Oct 28 '09 at 21:11
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7 Answers

If you only use one PC, none. If you work in a hot-desking environment, or even just occasionally use another PC, the your entire Exchange folder will be downloaded when you start Outlook. If you are subject to a quota, not such a problem but if you've several GBs of data stored on Exchange, bit of a pain in the network.

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Our administrator publishes Outlook on a terminal server and doesn't need dozens of users keeping a copy of their overstuffed 2GB Exchange cache there. –  Stephen Jennings May 1 '10 at 4:37
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When Cached Exchange Mode is enabled, Search Folders will not work properly in Outlook Web Access. For example, you may not be able to see the Unread Mail search folder.

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Welcome to superuser. Please do not include signatures or sign-offs in your answers, questions, or comments. –  Jeremy W May 30 '12 at 4:30
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I suppose that you could be used to Exchange and think you are connected, click send and quickly suspend or shutdown before being on the VPN / network and then forget to send? :S

I can't really think of any serious downsides either.

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New feature? Wasn't it introduced 6-7 years ago? :) –  Roee Adler Oct 28 '09 at 19:13
    
ehh... been a while since I used Exchange last... I will delete last para! –  William Hilsum Oct 28 '09 at 19:16
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I use Outlook in Cached Mode on several computers, and the main disadvantage is that changes are not propagated to the server immediately. This means that if I move a message to a folder, or add an appointment to my calendar and then immediately suspend, those changes aren't reflected on any other client (until I wake back up and give it a few minutes to sync).

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How long is the delay? –  Roee Adler Oct 28 '09 at 20:47
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Not sure about newer versions but the default in Outlook 2003 was to only sync directory changes once a day in cached mode.

This means that you might not be able to email that new member of staff to welcome them to the office if they only started today, also you'll only pick up mailing list membership changes (and new mailing lists) at the sync, so if you send a mail to your team's mailing list welcoming the colleague who's just transferred in they might not get it.

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What about the obvious security issue about having OST files left on the users local PC? Anyone could access the OST files and get unauthorised access to their emails. For that reason alone it may be appropriate to disable cached mode.

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The problem kicks in when the mailbox is over 2GB in size. Outlook hangs or crashes and you have to delete your profile and reload it all over, resulting in probably the same thing.

It's not cool to tell your CEO that his mail is gone for the next little while. Oh, you had .PST archives too? Where are they located? Oh, you don't know?

It's great if you inform your employees in time to archive their mail, save the data files on the file server, and everyone knows exactly what that means. Sometimes that message gets a little lost in translation.

I can never recommend anyone running cached-mode on workstations will never get dragged out of the building anyway. Laptops, possibly, but only if the person is informed not to stash up to 6 years of mail in their mailbox.

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