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Shrink your mailbox with a PST file
These tips can improve the performance of Outlook 2007 Beta.
Read Joshua’s article for more troubleshooting tips.
Joshua’s first suggestion: Reduce the size of your mailbox with a PST file. To create a new offline folder for Outlook (PST file): Click File | New | Outlook Data File. You can now archive messages to the PST file, which prevents Outlook from automatically loading. You can access your PST when you want to read the archived messages. If you have a large mailbox, this tip will increase the speed of nearly any Outlook version.
Outlook Trust Center
You can also improve Outlook 2007 Beta’s performance by removing unnecessary Outlook add-ins. Add-ins are listed in the Outlook Trust Center. To open the Trust Center, click Tools | Trust Center.
Remove unnecessary Outlook add-ins
To view the current Outlook add-ins, click Add-ins from the Trust Center’s left navigation column. You can disable and re-enable them from here. Many Add-ins for previous versions of Outlook may not be compatible with Outlook 2007 or cause unexpected behaviors or slowness in Outlook.
Remove Windows Fax Services
I have personally increase Outlook 2007 Beta’s performance by removing Windows Fax Services. To accomplish this, open the Windows Control Panel, click Add or Remove Programs, and select Add/Remove Windows Components. Uncheck Fax Services and click Next. If you require Fax Services, you may want to avoid Outlook 2007 Beta.