# About Login IDs

MiCollab Client credentials are communicated to the user via a Welcome E-mail Message that you can generate for each user after you provision the system.

MiCollab Client credentials include:

- Fully Qualified Domain Name (FQDN) for the MiCollab Client Service (required for the Desktop Client installation)

- MiCollab Client Login ID (simple, or fully qualified Login ID – used to log in to the MiCollab Client user interfaces)

- MiCollab Client Password (used to log in to the MiCollab Client user interfaces)

You can also log in to the MiCollab client using the UPN. The UserPrincipalName (UPN) attribute must be in the internet-style sign-in format where the username is followed by the @ sign and a domain name.

Note: The UPN login is supported only in the integrated mode.
Note: The presence of the peered users with the login ID as UPN will be seen only when both the peered servers are on MiCollab version 9.4 and above.

The value entered for the Login ID field on the Account Details page provides the simple Login ID for the user. If you are managing a single Enterprise deployment, users are provided with a simple Login ID (for example, john_smith) via the Welcome E-mail Message.

The Login ID:

- must be unique.

- supports ISO8859-1 characters.

- can be between 2 and 113 alphanumeric characters in length.

- can be numeric, but should not conflict with any other user's DN. The user can use his own DN as a Login ID.

The UPN login specifications are as follows:

- The userPrincipalName (UPN) attribute must be in the internet-style sign-in format where the user name is followed by the @ symbol and a domain name. For example, username@abc.com.
- The maximum number of characters for the UPN attribute is 113. A specific number of characters are permitted before and after the @ symbol; the specifications are as follows:
  - maximum number of characters for the username, that is the characters before the @ symbol should not be more than 64
  - maximum number of characters for the domain name following the @ symbol should not be more than 48
  - the @ symbol is required in each userPrincipalName value
  - the @ symbol cannot be the first character in each userPrincipalName value
  - the username cannot end with a period (.), an ampersand (&), a space, or with the @ symbol
  - the username should not have spaces
  - routable domains must be used; for example, local or internal domains cannot be used
  - unicode is converted to underscore characters
  - userPrincipalName cannot contain any duplicate values in the directory

Note:

MiCollab does not support the @ character as the first or last character in the UPN value.