Issue : Error received when for few user tried to change the "Set as Reply"
The Proxy address "MBX:0" is already being used by "org/users/username". Please choose another proxy address
Resolution : From the ADSIEdit.msc, remove the Problematic address from the Attribute "ProxyAddress"
Users had been migrated from Exchange 2003 to Exchange 2010, while moving mailbox Exchange stamps mailbox for processing with MBX:0 and MBX:1 likewise
The Proxy address "MBX:0" is already being used by "org/users/username". Please choose another proxy address
Resolution : From the ADSIEdit.msc, remove the Problematic address from the Attribute "ProxyAddress"
Users had been migrated from Exchange 2003 to Exchange 2010, while moving mailbox Exchange stamps mailbox for processing with MBX:0 and MBX:1 likewise
Thank you Leslie for ur comment, glad that it helped in some way
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