Hi, There are 10 users accessing a single mailbox at the same time using outlook. I want to know the maximum number of users. Although still at this limit, some of the users do not connect or their outlook stops responding. Thanks Server: Exchange 2007 Clients: Outlook 2003 SP1 Mailbox: 1 Users: 10+ Mailbox size: 5GB

On Tue, 9 Nov 2010 02:41:21 +0000, Studentforever wrote: >Hi, There are 10 users accessing a single mailbox at the same time using outlook. I want to know the maximum number of users. Although still at this limit, some of the users do not connect or their outlook stops responding. Thanks Ten users isn't a very large number. >Server: Exchange 2007 > >Clients: Outlook 2003 SP1 > >Mailbox: 1 > >Users: 10+ > >Mailbox size: 5GB Are they using the mailbox as their primary mailbox, or is it a delegate mailbox? Are they searching the mailbox? What release of Exchange? What release of desktop O/S? What release of MS Office? --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP

sounds like this is a shared mailbox where each user has "full" and send as access . send as may not be there there is no specified limit on numbers of users connection at a time. for exchange it is just a RPC request, and i/o. using cached exchange mode is recommended. you should have added this cuncurrency factor while planning capacity for exchange serverDhruv || Email - Polaris_1942@hotmail.com

Suggest you look at http://technet.microsoft.com/en-us/library/cc535025(EXCHG.80).aspx - Understanding the Performance Impact of High Item Counts and Restricted Views If you have more than 11 users constantly accessing a mailbox the server will be tearing down and setting up new views all the time which will have an impact on them and anyone else on the server. It's a very expensive operation as far as Exchange is concerned. Especially if they are looking at calendars. Neill