Hi all, I have changed the limit on the size of a mailbox for one of my users but he is still unable to send/receive. How long will the change take to have an effect on the user? Thanks

Usually around two hours. Exchange caches a lot of information and that cache is flushed every two hours by default. While you can reduce the cache it isn't a recommended task as it increases the load on the domain controller when Exchange does a cache refresh. Simon. Simon Butler, Exchange MVP Blog | Exchange Resources | In the UK? Hire Me.

up to 2hrs as mentioned by Sembee. Mailbox Size Limits Are Not Enforced in a Reasonable Period of Time http://technet.microsoft.com/en-us/library/bb684892(v=exchg.80).aspxJames Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com