I need some expert advice for following softwares:

1. Task Schdulers (organization wide) : Ideally I'm looking something
like MS Outlook but preferrably software should be server based &
should eliminate email exchanges other than application to user (for
reminder purposes). Also it should eliminate the limitations of
outlook like:
 ---- Outlook can't assign one task to multiple people
 ---- Task should not be marked completed without assigner's consent etc.

2. Spam mail filter:
-- for our IMAIL/MailEnable server
-- for outlook express
-- White/Black list services (thirdparty servcies)

3. Lead/Order/Contact management software for software company

4. Timesheet to manage various projects/people/costs. I'm looking
toward some low cost solution here.

5. Accounting software (ideally only account receivables & payables)
but to manage Parent & Subsidiary relationship (For eg. software
should be able to manage A/R & A/P of Parent & also of a subsidiary of
that parent where Parent raise an invoice to subsidary)

I need atleast 3 suggestions in each of category. Please try to give
me in following format:
Suggested software, Cost, URL, your remarks

I've kept price of $10 as I think this might be little easy for
proficient users. But if you feel that I need to hike the price,
please feel free to write.

Regards,
Amit Mehta
http://www.planetace.com

tikdam-ga,

As far as task scheduling and calendaring applications go, I have had
success with a 75 person organization using Brown Bear Software's
Calcium:

http://www.brownbearsw.com/calcium/

Another application that was considered was called Web Event.

Hope this helps,

omniscientbeing-ga

If you use email client Outlook 2000/2002/2003 or Outlook Express
5/5.5/6, then I can suggest you to use bayesian spam filters that are
incorporate into Outlook or Outlook Express. I use Spam Bully from
http://ww.spambully.com . Spam Bully support POP3, IMAP and Hotmail
accounts, also works for exchange accounts, but is not server based
application yet.
you can try it, it's very efficient, it kill more than 99% after I
learned from my personal messages.