Applies to: Exchange Server 2007 SP3, Exchange Server 2007 SP2, Exchange Server 2007 SP1, Exchange Server 2007
Topic Last Modified: 2008-10-31

This article describes characters that you cannot use in object names in Microsoft Exchange Server 2007.

When you create names for components or objects in Exchange 2007, the name cannot contain any of the unsupported characters. Also, if you try to import or connect to objects whose names contain characters that are not supported, you may receive an error message, or unexpected behavior may occur.

Table of Characters That Are Not Supported for Object Names

Exchange object	Exchange scenario or component	Unsupported characters	Character limit
Organization name, site name	Running the Setup program or moving mailboxes	~ tilde ` grave accent ! exclamation point @ at sign # number sign $ dollar sign % percent ^ caret & ampersand * asterisk () parentheses _ underscore + plus sign = equal sign {} braces [] brackets \| vertical bar \ backslash : colon ; semicolon " quotation mark ' apostrophe <> angle brackets , comma . period ? question mark / slash	64
Administrative group name	Running the Setup program	~ tilde ` grave accent ! exclamation point @ at sign # number sign $ dollar sign % percent ^ caret & ampersand * asterisk () parentheses _ underscore + plus sign = equal sign {} braces [] brackets \| vertical bar \ backslash : colon ; semicolon " quotation mark ' apostrophe <> angle brackets , comma . period ? question mark / slash	64
Microsoft Exchange Server 5.5 computer name	Connection agreement or mail flow	. period	64
E-mail domain field	Simple Mail Transfer Protocol (SMTP) connector	~ tilde ` grave accent ! exclamation point @ at sign # number sign $ dollar sign % percent ^ caret & ampersand * asterisk () parentheses + plus sign = equal sign {} braces [] brackets \| vertical bar \ backslash : colon ; semicolon " quotation mark <> angle brackets , comma . period ? question mark / slash	64
Domain Name System (DNS) namespace	Running the Setup program	_ underscore	64
Smart host name	SMTP	Leading spaces or trailing spaces	64
Recipient policy SMTP address	Viewing public folder hierarchy	~ tilde ` grave accent ! exclamation point @ at sign # number sign $ dollar sign % percent ^ caret & ampersand * asterisk () parentheses + plus sign = equal sign {} braces [] brackets \| vertical bar \ backslash : colon ; semicolon " quotation mark <> angle brackets , comma . period ? question mark / slash	64
Recipient policy SMTP address host name	Mail flow	.. two periods	64
Host name of connector address space	Mail flow	.. two periods	64
Recipient name	SMTP	' apostrophe " quotation mark	64
Exchange server host name	SMTP	_ underscore	64
Organization internal directory name	Directory	~ tilde ` grave accent ! exclamation point @ at sign # number sign $ dollar sign % percent ^ caret & ampersand * asterisk () parentheses _ underscore + plus sign = equal sign {} braces [] brackets \| vertical bar \ backslash : colon ; semicolon " quotation mark ' apostrophe <> angle brackets , comma . period ? question mark / slash	64
Site internal directory name	Viewing the public folder hierarchy	? question mark () parentheses * asterisk	64
Mailbox name	Running the Setup program	/ slash	64
Public folder tree name	Viewing and creating the public folder	: colon ; semicolon	64