[Zope] Zope 2.7b3 & CMF1.4.2 conflict on Win2K and WinXP?

[Marcel Maré]

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