We have an in house mail server running Exchange Server 2003 Enterprise Edition. Our client PCs run Outlook 2000. Some users have mentioned that appointments that they accept from other people are being deleted off their Outlook calendar. Basically I have setup a conference room as a Windows account and have it to automaticllay accept meetings or notify of conflicts. The user would select it as a resource and then invite additional people. I have given another user Editor rights. The Editor also receives the meeting requests and accepts the meetings for the users - thus it would post on the Outlook calendar. The last time someone mentioned a meeting was dropped I recieved event ID #s 8230 & 8206 with EXCDO as the source. Microsoft recommends not to scan the M drive but I don't have one in Exchange 2003. I also have the MSExchangeFBPublish key and its subkeys in the registry. We are using Symantec Antivirus Corporate Edition and I have made the appropriate exclusions on the mail server for file scanning as per Symantec documents. We also use Symantec Mail Security 4.6 for Exchange. The users who had this problem have Blackberry PDAs which are tied to a Blackberry Enterprise Server for emails. Wouild greatly appreciate any help to try to resolve this appointment dropping in Outlook.