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45

Zimbra is an excellent opensource, linux based alternative to Exchange. It combines Apache Tomcat, Postfix, MySQL, OpenLDAP and Lucene in a single, well defined package. It offers: LDAP Authentication Calendaring, resource booking and free/busy info Ability to connect using outlook, and its own Zimbra client Excellent web interface Allows multi server ...


15

At my last job I migrated us off of Intermedia's Exchange service to Kerio Mail Server. It has great webmail (much easier and lighter than OWA), LDAP, ActiveSync and support for NotifyLink/Sync. It looks like Exchange to anyone using Outlook or Entourage. GAL, resource booking, calendars, built-in spam and AV. Stores everything in flat RFC822 files so no ...


12

Another option is Scalix. Of your list, it supports: Authentication through SQL or LDAP. Has a solid, comfortable web interface for the users when they are off-site Supports replication and load balancing Outlook client support (or a really good alternative client) Resource booking Calendar (shared/private) and Email A cross-platform client for us ...


8

Thunderbird with the Lightning extension. I use this combination via DavMail gateway to get seamless access to Exchange. Works perfectly (and is much better/faster than Outlook 2007).


8

Evolution can communicate with the Exchange server. To connect to the Exchange 2007 server, you need to install the mapi-exchange package. http://library.gnome.org/users/evolution/stable/usage-mainwindow-starting.html.en#second-step


7

Maybe not exactly what you are looking for, but: Have you considered switching to Google Apps? They now have an Outlook plug in.


6

Not sure if you are willing to look into a complete collaboration suite. But Zimbra has awesome calendaring and not to mention the great email web client/server. They have an open source version(FOSS) which is great for most needs and a paid/supported version (Network).


5

Have you tried Evolution? I used it for a while against an exchange server, and had no problem with calendar items.


5

The DAViCal CalDAV server will probably do what you're looking for (and has LDAP authentication). I use it with Mozilla Sunbird and it works great.


4

Get your Exchange admins to upgrade to Exchange 2010. The web client is actually usable in Firefox, in fact it's almost identical to the experience in IE.


4

I have Outlook 2002 and this is in Tools > Options then Preferences Tab > Email Options > Advanced Email Options There is a check box called "Delete meeting request from Inbox when responding" If it's the same in 2003, I'd uncheck that!


4

Open Xchange Yes, I'm a little late for the party and not a little surprised that OX hasn't been mentioned. I'm pretty sure it meets and/or exceeds the OP's requirements. And for another option, keep your ear to the rails to see what Cisco does with PostPath which was a promising Exchange alternative.


4

Have you ever heard about Kolab? It is Free Software (GPL). You can buy support contracts, if you need: Kolab Systems AG. Kolab combines OpenLDAP, Postfix, Cyrus IMAP, Apache, SASL and OpenSSL plus some glue-code of its own to support all the features you have asked for, including the optional ones. You can use Outlook as a client, or any standard POP/IMAP ...


4

The default is to publish free/busy data for something like 1 month into the future. You just need to change the settings in Outlook. It's easiest to accomplish with a GPO if you're in an AD setup. edit: Outlook controls the publication of the free/busy data. If you have a resource, you can either login with Outlook to the resource (use an Admin account, ...


4

If you're on Exchange 2010 SP1, you could enable Internet Calendar Sharing and publish User B's calendar in iCalendar format for User A to pick up. This Microsoft Exchange Team Blog post goes into detail on the subject, though it's a bit wordy and mixed in with some other cloud-peddling bumph. Probably the most relevant bullet point to you is this one: ...


3

http://www.zarafa.com/ late in answer but you try this also


3

This article is only a few months old and provides some pretty good ideas about what to look out for in the current options: http://www.h-online.com/open/Open-source-Exchange-replacements--/features/113133 If pushed we’d have to say that the Z-twins (Zimbra and Zarafa) offer, arguably, the best level of Exchange/Outlook compatibility, with little to ...


3

You have OBM from Linagora. It's main objective is to replace Exchange. Most of the web site is in French but you can probably contact them and get info.


3

I know you asked for non-MS, but Small Business Server 2008 does everything you asking for, is extremely widely supported, and is pretty easy to get going. It's not the cheapest at about $3000 Retail if you have a server already, but it's a fair amount cheaper if you buy it with a server (like from HP or Dell). You do have to consider the cost of support ...


3

I'm using Davical, very satisfied with it. Easy to use and with LDAP support.


3

Exchange 2010 SP1 introduces Internet Calendar Sharing, which essentially allows you to do what you want. The Exchange team posted a very detailed blog post recently about the topic, which I highly recommend you read over. Basically, Exchange publishes your calendar in iCal format which anybody can subscribe to. The instructions to set it up are in this ...


2

This can easily done with the setperm utility. I've honestly never used it for Exchange 2007 only on Exchange 2003, but it shows as supporting it. There is also some great screenshots and info here: http://telnetport25.wordpress.com/2007/07/25/exchange-2003-change-mailbox-folders-permissions-in-bulk/


2

It is possible with Powershell but it only effects current mailboxes. Future mailboxes won't have that access. What you could do is just do a windows schedule and run the powershell command for it. Another option is to use the SetPerm tool which edited the permissions on the default mailbox. This has the advance of being for all future mailboxes.


2

There unfortuantley is not an easy PowerShell command to do this, however using PFDavAdmin - the Public Folder DAV admin tool from MS, you can do so. This article explains the process in doing so.


2

As mentioned by LEAT, to do this you will need to setup a trust between your two seperate Active Directory Forests. Firstly, you will need a link between the Forests, in your case it looks like your going for a VPN, once thats up you will need to setup your DNS on both domains so that the Exchange servers can resolve each other. Once that is done you need ...


2

I don't believe you can do this. Entourage is a very limited mail client and isn't a Mac version of Outlook exactly. In fact, Entourage accesses mail via Outlook Web Access, so in a way you can consider it more on par with the features of OWA than with the Outlook client. Perhaps just making the link to the SharePoint calendar more accessible is your best ...


2

I installed the network version of Zimbra for a company last summer. It meets everyone of your needs plus support palm, blackberry and windows mobile over the air sync. It was very slick and the Outlook connector worked very well for not only mail but Calendaring and resource scheduling as well. It has a great web front end and *nix users can use ...


2

There's no built-in way to do what you want, but here are some nice third-party instructions: http://exchangeshare.wordpress.com/2008/05/27/faq-give-calendar-read-permission-on-all-mailboxes-pfdavadmin/ This utility should do it too, but I've never used it: http://www.slipstick.com/files/setperm.zip Do be sure you use groups in your permissions so that you ...


2

You might try taking two users who have this problem and launching Outlook on their machines with the /cleanfreebusy switch, which will reset the free/busy bitmap for their calendars. You can then try scheduling meetings between the two of them and see whether that fixes the problem.



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