If you are transitioning from Exchange 2007/2010 to Exchange 2013, we will see that the reported size of the mailboxes will increase around 30 to 40%! Don’t be alarmed just yet. The actual space used by the mailbox database will not increase by 30% as this only refers to the attribution of space used by each individual mailbox.
Basically, Exchange 2013 now includes in the mailbox size attribute all the properties of items in a mailbox, thus providing a more accurate calculation of space taken by items in a mailbox and, therefore, the whole mailbox itself.
The problem with this is that, during a migration, users might exceed their mailbox quota when their mailbox is moved to Exchange 2013 and be prevented from sending and/or receiving e-mails…
So, in order to prevent this from happening, I suggest increasing everyone’s mailbox quota by 40% prior to their move. You can either do this at the mailbox database level if your users are using the database quotas, or individually on a per-user basis.
For example, if you want to increase by 40% the ProhibitSendQuota value for all users that are not using the database quota defaults, you can use the following cmdlet:
Get-Mailbox -ResultSize Unlimited -Filter {UseDatabaseQuotaDefaults -eq $False} | Where {$_.ProhibitSendQuota -ne “unlimited”} | ForEach {Set-Mailbox $_ -ProhibitSendQuota “$($($_.ProhibitSendQuota).Value.ToMB() * 1.4)MB” -WhatIf}
However, don’t forget to set the IssueWarningQuota or ProhibitSendReceiveQuota if you are using them! Note that this is not the best method as users might end up with a quota of 1523MB for example when the ideal value would be 1500MB…
From Exch 2010 to 2016, First I have to increase size in 2010 Mailbox. Try to run this command in 2010 PS, I get error:
Pipeline not executed because a pipeline is already executing. Pipelines cannot be executed concurrently.
+ CategoryInfo : OperationStopped: (Microsoft.Power…tHelperRunspace:ExecutionCmdletHelperRunspace) [],
PSInvalidOperationException
+ FullyQualifiedErrorId : RemotePipelineExecutionFailed
Which command are you running exactly?
Get-Mailbox -Database “Database_Name” -ResultSize Unlimited -Filter {UseDatabaseQuotaDefaults -eq $False} | Where {$_.ProhibitSendReceiveQuota -ne “unlimited”} | ForEach {Set-Mailbox $_ -ProhibitSendReceiveQuota “$($($_.ProhibitSendReceiveQuota).Value.ToMB() * 1.4)MB” -WhatIf}