We have a customer experiencing locking up in Outlook 2007 with a hosted Microsoft Exchange 2008 server. Here are several suggestions that I found when researching the trouble:

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update for Outlook 2007: April 13, 2007 http://support.microsoft.com/kb/933493/

1. Exchange users: Remove Outlook 2003 and do a clean install of Outlook 2007, making sure that a new offline store is created from scratch.
2. Run on Vista.
3. Turn off indexing. Tools - Options - Search options - uncheck all folders. Its a shame to do this as the indexed search is useful.
4. Let indexing complete. Might be worth leaving the machine running overnight.
5. Reduce the size of your mailbox (of course).

http://www.itwriting.com/blog/54-outlook-2007-is-slow-rss-broken.html

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(The following article lists out some good information for troubleshooting the application) Problem with Outlook 2007 - Email Receive is Broken!
http://www.roundtripsolutions.com/blog/2007/02/19/208/problem-with-outlook-2007-email-receive-is-broken/

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Look for this item:
Tools->Trust Center and went to the Add-Ins tab. Sure enough, Windows
Tools->Search Email Indexer
uninstall "Windows Desktop Search"

The solution is to disable the live desktop search indexing for Outlook in the preferences (right click on the magnifying glaas icon in the tray bottom right on your screen), edit and deselect Outlook (and anything else if you want it to stop completely).
Enjoy fast(er) Outlook again.
http://www.embracingchaos.com/2007/06/outlook_2007_lo.html

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After installation of Office 2007 SP1, I noticed Outlook 2007 was hanging when navigating from Calendar to Mail panes. I regularly had to end Outlook with the Task Manager.
Until now, I had the "To-Do Bar" displayed with the Mail pane. Removed it. I can confirm that navigation between the two panes is now smoother.
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I just spent $49.00 to pay for support on Microsoft to get the hanging and freezing problem fixed. While I hate the idea that I had to pay for it (since Gateway Tech Support was clueless on this problem), I had not choice but to pay the fee. Nevertheless, after trying everything in the book, they fixed the problem.

Let me tell you what DID NOT work so that I can save you the agony of spending hours.

* Re-loading my Outlook 2007 did not work.

* Re-loading Office Vista did not work.

* Re-loading Vista Operating System did not work.

* Installing and re-installing updates did not work.

* Removing Adobe Acrobat did not work.

* Reducing the size of the .pst file did not work.

Here are the steps that I did to stop the freezing and hanging so that you don't have to pay the $49.99 fee that I had to pay.

- In Outlook, go to "Tools";

- Select "Trust Center"

- In Trust Center, click "Add-Ins"

- At The Bottom Make Sure That "Com Add-Ins" is selected and Click "Go"

- You must uncheck, as many of the add-ins as possible. There may be some Microsoft programs that it will not let you uncheck. That's OK. Uncheck as many items as possible.

- After you are done, you must close Outlook 2007 completely and restart Outlook.

When I did this, the hanging and freezing stopped and my computer also stopped crashing. You should note that if you are using add-ins like Plaxo, MagicJack, or similar applications, these programs may re-appear in your Outlook the next time you boot your computer unless you remove them completely. So if the problem appears fixed, but it re-appears, you may want to check to be sure that some of those add-in's didn't re-appear in Outlook 2007.

I hope this is helpful to you.
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outlook /resettodobar

outlook /cleanprofile

outlook /cleanviews

outlook /cleandmrecords
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http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=2755269&SiteID=17

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Outlook 2007 just started freezing for me today. I had just applied a handful of updates from Microsoft update and after doing so, Outlook was freezing when I launched it. I was going to begin uninstalling all of the patches one-by-one, and by coincidence, the first one I uninstalled (KB934062) seemed to fix my problem with Outlook 2007. I hope this helps you and others experiencing the same problem. Post either way.
http://office-outlook.com/outlook-forum/index.php?t=msg&th=60188/

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outlook 2007 hangs search Google