Section I: Conflict with program 1and1

Note: This will uninstall 1and1 Office Drive Manager and remove all functionality associated with it.

Click Start,Control Panel.
Click Programs & Features or Add/Remove Programs.
Right-click any entries named 1and1 and select Uninstall.
Open Sage 50. If you still receive the error proceed to Section II.

Section II: Sharing

Verify you sharing permissions are set correctly […]

Resolution for '1and1 issue: 'damaged?Error: “File System Error 11 in SERIAL.DAT”' available: Yes.

The 1and1 issue or error code is a known related to Sage Accounting products. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the 1and1 issue yourself by looking for a resolution described in the article. If it is a complex 1and1 issue or you are unable to solve the issue, you may contact Sage Repair by clicking here or by using other 1and1 support options.

For more information about resolving issues related to 1and1 in Sage Accounting or to get support for the issue 'damaged?Error: “File System Error 11 in SERIAL.DAT”', click the link below: