I have installed a new Zope 2.7.b3 and put the CMF products in the zope-instance/Products folder. Zope then fails to start with this error: Traceback (most recent call last): File "C:\devel\python\Zope-2.7.0-b3\lib\python\Zope\Startup\run.py", line 27, in ? run() File "C:\devel\python\Zope-2.7.0-b3\lib\python\Zope\Startup\run.py", line 24, in run start_zope(opts.configroot) File "C:\devel\python\Zope-2.7.0-b3\lib\python\Zope\Startup\__init__.py", line 50, in start_zope starter.startZope() File "C:\devel\python\Zope-2.7.0-b3\lib\python\Zope\Startup\__init__.py", line 218, in startZope Zope.startup() File "C:\devel\python\Zope-2.7.0-b3\lib\python\Zope\__init__.py", line 46, in startup _startup() File "C:\devel\python\Zope-2.7.0-b3\lib\python\Zope\App\startup.py", line 47, in startup OFS.Application.import_products() File "C:\devel\python\Zope-2.7.0-b3\lib\python\OFS\Application.py", line 512, in import_products import_product(product_dir, product_name, raise_exc=debug_mode) File "C:\devel\python\Zope-2.7.0-b3\lib\python\OFS\Application.py", line 534, in import_product product=__import__(pname, global_dict, global_dict, silly) File "C:\devel\python\Zope-instance\Products\CMFCalendar\__init__.py", line 20, in ? import CalendarTool File "C:\devel\python\Zope-instance\Products\CMFCalendar\CalendarTool.py", line 18, in ? import calendar File "C:\devel\python\Zope-2.7.0-b3\bin\Lib\calendar.py", line 8, in ? import datetime ImportError: No module named datetime I get the same error with CMF 1.4.1 and also on 2 different PCs (2000 and XP). Using CMF1.4.2 with Zope 2.6.1 works fine. Any ideas? TIA Marcel