Novell Client 2 SP2 for Windows 2008 R2
XenApp for Windows 2008 and 2008 R2 support for Novell is through Novell Domain Services for Windows.
Citrix current support for Novell:
For Citrix XenApp 5.0 for Windows 2008 (32 and 64-bit) and Citrix XenApp 6.0 for Windows 2008 R2, Novell support is through the use of the Domain Services for Windows http://www.citrix.com/ready/partners/novell/products/dsfw to allow for a Citrix environment to work with Novell.
The Novell Client can still be present on the Citrix server itself and/or on the end-user workstations. Any issues in having Novell Client present are no different with Citrix than they are with any other product that employs its own Windows credential provider, since the Novell Client also provides it's own credential provider to help enable a user to logon to both Windows and eDirectory at the same time.
Use of the Novell Client credential provider is not strictly "required"; it's just the default installation mode, and the mode most customers want for logging into both Windows and eDirectory at the same time.
Because many usage scenarios of Citrix involve using the Citrix credential provider, it may be desirable to use the "Login with non-Novell Credential Provider" configuration (See TID 7004709). This essentially disables Novell Client's credential provider, and allows the user to login using a Windows account only (whether in conjunction with Citrix or not), thereby avoiding credential provider-based conflicts or issues. Novell Client then employs a non-credential provider-related eDirectory-only login after the Citrix credential provider has accomplished the Windows logon, but before the user's desktop is presented.
Novell supports the Novell Client in a Citrix environment, and will investigate and attempt to resolve any Novell Client issues occurring in a Citrix environment.