I have tried to no avail to setup a plan to include "unlimited" sized mailboxes. According to the feature description of the feature prohibitSendReceiveQuota it says:
"Specifies the mailbox size at which the user associated with this mailbox can no longer send or receive messages. You must specify either an integer or "unlimited." If you set this attribute on a mailbox, that mailbox setting overrides the value that is set for this attribute on the mailbox database"
When i set this to unlimited however it fails on mailbox creation, saying:
"A non integer or negative value was supplied for argument actualFree which requires a positive integer value "
my question is, has anyone else been able to get this to work? It would appear the they intended on allowing this to happen, perhaps I am doing something wrong?