That is correct.Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

PrefixString is uppercase if the address is a reply address, lowercase otherwise. Prefix is always uppercase.Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Thanks for the Reply, so as i read, that the "-eq" Operator is no Case Sensitiv the script should work as expected. thanks and regards

Hello Guy's i just made a small Powershell Script. The Goal was to Return Every Mailbox wich has more than one SMTP Adresse. For this reason i needed to Filter out all SMTP Adresses. To Filter i i used the Value "prefixstring" at the e-mail addreses. But i also saw the Attribute "Prefix", and i want to know is there is any difference. For Example if you go into powershell: a$ = get-mailbox -idetity user1 and then you enter a$.mailaddresses The you get all Addresse of the user, including these two Attributes "Prefix" and "Prefixstring". Are these two always the same? Just if Someone is Curious thers the Script: $mailboxes = get-mailbox -resultsize 30000 foreach ($user in $mailboxes) { $count = 0 foreach ($mailaddress in $user.emailaddresses) { if ($mailaddress.prefixstring -eq "smtp") {$count++}} if ($count -gt 1) { echo "_____________________" | out-file -filepath c:\temp\mailaddressen.txt -append echo " " | out-file -filepath c:\temp\mailaddressen.txt -append echo $user.displayname | out-file -filepath c:\temp\mailaddressen.txt -append foreach ($mailaddress in $user.emailaddresses) { if ($mailaddress.prefixstring -eq "smtp") {echo $mailaddress.addressstring | out-file -filepath c:\temp\mailaddressen.txt -append}} echo " " | out-file -filepath c:\temp\mailaddressen.txt -append } }