Not advisable. By design, Exchange 5.5 will replicate some DLL files from the server with the latest service pack.
So those server with SP3 will get the latest DLL files from the OWA that is running SP4. Not exactly sure which DLL files are replicated over, can't find the exact article, nearest I can fine is Q147929, the following sentences, ==== If this file exists on another Exchange Server computer in the same site, it is dynamically replicated the next time the IMC property page is opened. ===== I will suggest just apply SP3 to OWA, then later on upgrade all servers to SP4 later. Ong LB NIE/Singapore -----Original Message----- From: Carl Houseman [mailto:[EMAIL PROTECTED]] Sent: Wednesday, July 10, 2002 2:18 PM To: MS-Exchange Admin Issues Subject: RE: First OWA install Will PSS still provide for free, patches that are included in 5.5 SP4? Or is my only option to install SP4? If I must install SP4, is OWA at SP4 against Exchange at SP3 a bad idea? thanks. Carl -----Original Message----- From: David N. Precht [mailto:[EMAIL PROTECTED]] Sent: Wednesday, July 10, 2002 2:00 AM To: MS-Exchange Admin Issues Subject: RE: First OWA install Not a lot of OWA related fixes but.... XWEB: Attachments Cannot Be Opened in OWA 5.5 SP3 (Q252494) -----Original Message----- From: Carl Houseman [mailto:[EMAIL PROTECTED]] Sent: Wednesday, July 10, 2002 00:23 To: MS-Exchange Admin Issues Subject: First OWA install I'm about to install my first OWA server onto an existing IIS server. The server does not currently have any SSL certificate. The intent is to make an SSL site for OWA that is accessible to the Internet. The OWA/IIS server will be inside the firewall (naturally) accessing Exchange on a different box. Exchange 5.5 SP3, IIS 4. So this is my intended ordering of The Things That Need To Be Done: 1. Install all security patches 2. Install IIS lockdown/URLscan, with provisions needed to permit OWA operation (Q309508) 3. Generate SSL key pair, generate certificate from cert server (another machine), and install cert. 4. Create new SSL web site for OWA 5. Install OWA from 5.5 CD to site created in step 4 6. Patch OWA to SP3 Is this the correct order and is anything major missing? One thing I'm not sure of is whether the OWA install can create the SSL web site, and if so, then step 4 isn't needed. I don't want OWA availability on port 80, ever. Also, I know 5.5 SP4 is out there, but I'm under time constraint, and 5.5 SP3 is doing OK otherwise. Unless there major goofs relative to OWA fixed by SP4, I'd just as soon leave well enough alone. Thanks all, Carl Houseman List Charter and FAQ at: http://www.sunbelt-software.com/exchange_list_charter.htm List Charter and FAQ at: http://www.sunbelt-software.com/exchange_list_charter.htm List Charter and FAQ at: http://www.sunbelt-software.com/exchange_list_charter.htm List Charter and FAQ at: http://www.sunbelt-software.com/exchange_list_charter.htm
