DOCUMENT:Q78803 20-NOV-1999 [pcmail] TITLE :PC Ext: Estimating Memory Requirements for EXTERNAL.EXE PRODUCT :Microsoft Mail For PC Networks PROD/VER:WINDOWS:2.1,3.0,3.2,3.5 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Mail for PC Networks, versions 2.1, 3.0, 3.2, 3.5 ------------------------------------------------------------------------------- SUMMARY ======= You can use the following formula to estimate how much memory the Microsoft Mail for PC Networks External Mail program (EXTERNAL.EXE) will require to run without memory problems. There are two major categories of memory usage for EXTERNAL.EXE: 1. General Memory Requirements Memory Needed For ------ ---------------------- 200K EXTERNAL.EXE 64K message storage 16K modem traffic ------ 280K general memory required 2. External Postoffice Servicing Requirements (Servicing memory is required for mail dispatching, and so on.) The servicing memory requirements will vary directly with the number of postoffices that External is addressing. The servicing memory requirements need to be calculated for each postoffice separately because the number of external networks will be different. The following figures can be used to determine each postoffice's servicing requirements: Number of Local Users Multiplied (*) by 37 bytes Number of dispatch networks Multiplied (*) by 38 bytes Number of dispatch postoffices Multiplied (*) by 90 bytes Number of external networks Multiplied (*) by 45 bytes Number of external postoffices Multiplied (*) by 115 bytes Number of gateways Multiplied (*) by 83 bytes Number of gateway nodes/DGNs Multiplied (*) by 83 bytes For example: The following example will show the EXTERNAL.EXE memory requirements dispatching between two postoffices, each with 100 users defined. No gateways are involved. General External Memory Requirements 200K base EXTERNAL.EXE 64K for message storage 16K for modem traffic ---- 280K General Memory Requirements Servicing Requirements for two postoffices Postoffice 1 ------------ 100 local users * 37 = 3700 bytes + 1 dispatch networks * 38 = 38 bytes + 1 dispatch postoffice * 90 = 90 bytes + 2 external networks * 45 = 90 bytes + 10 external postoffices * 115 = 1150 bytes + 0 gateways * 83 = 0 bytes + 0 gateway nodes/DGNs * 83 = 0 bytes ---- 5068 bytes Postoffice 2 ------------ 100 local users * 37 = 3700 bytes + 1 dispatch networks * 38 = 38 bytes + 1 dispatch postoffice * 90 = 90 bytes + 1 external networks * 45 = 45 bytes + 1 external postoffices * 115 = 115 bytes + 0 gateways * 83 = 0 bytes + 0 gateway nodes/DGNs * 83 = 0 bytes ---- + 3988 bytes Total External PO Requirements = 9056 bytes Total External Requirements = 289,056 bytes Additional query words: 2.10 3.00 3.20 3.50 memory requirements ====================================================================== Keywords : Technology : kbMailSearch kbZNotKeyword3 kbMailPCN320 kbMailPCN300 kbMailPCN350 kbMailPCN210 Version : WINDOWS:2.1,3.0,3.2,3.5 ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 1999.