As for an Exchange administrator, the most headache problem is to manage thousands of calendar items or troubleshoot calendar related issues. If there is no standard rules for using calendars, you event log will also be full of calendar error events.

In order to avoid such pains, here we summarized and made a best practice for your reference. Most of them are from the user side and some of them should be cared on the Exchange Server side:

1. Outlook with the latest service pack. Its better to have same version of all the Outlook client

2. Delegate and manager should use same Outlook build

3. Do not configure Outlook rules that move meetings

4. Manage meetings from one machine (Considering client side synchronization interval with the mailbox)

5. Single delegate (Avoid multiple delegates for one manager)

6. Dont create recurrent meeting requests without start or end day

7. Dont create recurrent meeting request longer than one and a half years

8. Exchange with latest service pack and rollup

9. BES (BlackBerry Enterprise Server) with latest service pack and hotfixes

10. Latest version of BlackBerry Desktop Manager

11. Latest cdo.dll on BES, also the same version cdo.dll on BES and Exchange Server.

If anything is missing, please feel free to reply this thread. Many hands make light work.

I'd like to add "avoid managing meeting requests via a mobile device, especially the ones with iOS" :)