Hey all I want to solve the problem with the event 9554 (source: msexchangeis), but it wont work :-( The error message is this: Unable to update Mailbox SD in the DS. Mailbox Guid: bfde47cd-f7c3-4ec0-992c-0701669a4d86. Error Code 0x8004010f Here is a link to eventid.net <http://www.eventid.net/display.asp?eventid=9554&source=> but the solutions there do not work eather :-( And the MS knowledgebase tells me this: Step 2: Change Mailbox Permissions 1. Start the Active Directory Users and Computers snap-in. 2. Right-click the user whose permissions you want to change, and then click Properties. 3. Click the Security tab, click to select the Allow inheritable permissions from parent to propagate to this object check box, and then click OK. NOTE: Do not select this check box for the built-in Administrator or for the Domain\Administrator objects. 4. Quit the Active Directory Users and Computers snap-in. Here is the link: - click - <http://support.microsoft.com/default.aspx?scid=kb;en-us;322308> But it also do not work :-( So maybe anybody from this list can help solve my problem, tia Mit freundlichen Grüßen Marco Zentarra Systemadministrator ONLine Distributions GmbH Unna - München - Dresden Heinrich-Hertz-Str. 4 D-59423 Unna Fon 02303 - 98601-305 Fax 02303 - 98601-601 eMail marco.zentarra@xxxxxxxxxxxxxxxxxxxxxxxxxx <mailto:marco.zentarra@xxxxxxxxxxxxxxxxxxxxxxxxxx> Web http://www.communication-companies.de <http://www.communication-companies.de/>